Try to call the RawDisk.GetDriverStatus method and if it's successful then check the output ServiceStatus.dwCurrentState parameter. It should be 4 (i.e. SERVICE_RUNNING). In the case there is a problem with the driver signing it will be set to 1 (i.e. SERVICE_STOPPED).

Unfortunately Comodo certificates won't work. Please refer to the instructions in the help file regarding driver signing - the instructions contain the link to Microsoft site with the list of accepted CAs (for which you need to take a cross-certificate from that page and then use the cross-certificate during signing).

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